On the outside looking in, the Pokemon TCG might seem like a game of elementary skill, where the more HP and attack power someone's card has, the likelier they are to win the game
You can't play with these cards in Standard, but they are, of course, legal in Commander, which is more widely played
Latios, along with its Mythical counterpart Latias, feature prominently in a lot of Surging Sparks promotional material, with the duo even featuring on one of the pack arts for the expansion
Setessan Champion and Season of Growth are the engine that generates card advantage and keeps your hand full of new aura enchantments
This big dino boy also has Trample, Haste and Toxic 4, meaning an opponent can be almost halfway dead (through normal damage and Poison counters) with one swing
As a result, the early prices were absolutely wild